A Raman spectroscopic study of the natural carbonophosphates Na 3MCO 3PO 4 ( M is Mn, Fe, and Mg)

Kozlov, Evgeniy Nikolaevich; Fomina, Ekaterina Nikolaevna; Bocharov, Vladimir Nikolaevich; Sidorov, Mikhail Yurievich; Vlasenko, Natalia Sergeevna; Shilovskikh, Vladimir Vladimirovich

Raman spectra of three natural carbonophosphates (sidorenkite, bonshtedtite, and bradleyite) with the general formula inline-formulaNa3MCO3PO4 (inline-formulaM is Mn, Fe, and Mg) were studied and compared. These spectra showed from 21 to 24 vibrational bands, of which the two most intense (inline-formula964±5 and inline-formula1074±3 cminline-formula−1) correspond to the inline-formulaυ1(P–O) and inline-formulaυ1(C–O) modes. These two bands split into doublet peaks due to the occurrence of isomorphic impurities. It was found that the crystallographic orientation of the sample influences the intensity of most bands. Most bands assigned to the same vibrations showed a regular shift (the smallest in sidorenkite spectra, an intermediate in bonshtedtite, and the largest in bradleyite). We propose an algorithm that allows for diagnostics of carbonophosphates in inclusions by their Raman spectra, providing a reliable result even in the absence of energy-dispersive X-ray spectroscopy (EDX) data.

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Kozlov, Evgeniy Nikolaevich / Fomina, Ekaterina Nikolaevna / Bocharov, Vladimir Nikolaevich / et al: A Raman spectroscopic study of the natural carbonophosphates Na3MCO3PO4 (M is Mn, Fe, and Mg). 2021. Copernicus Publications.

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